Drupal 8.x

On this page https://www.drupal.org/node/2257723 is the directions for the second part of a content migrate. It says:

"After installing the module, visit your Drupal 8 site's /upgrade page. When you do you will see this screen:..."

I'm running Drupal 8.0.2 on Acquia free dev cloud. I have disabled the authored on and authored by fields using
administration>structure>book>edit>form display but they still show up on the two books I have. I did the same thing on the page content type and it worked as you'd expect. Any suggestions? Thanks in advance.

Scenario

On a multilingual site, I need to show a list of vocabulary terms, not in text but all terms replaced by their respective image links.

Hi!
Faced with the following problem. It is necessary to allow users to import nodes through Feeds. One in the table fields must be specified id corresponding group in which materials (Entity Reference) will be added.

I need to somehow check two conditions:
1. If the current user created group to which it imports.
2. Has the current user author permissions to this group or not.

Prompt how to solve? Maybe there is a ready-made module or plug-in for Tamper. Thanks in advance.
(google translate) sorry for this

I'm describing custom tables to views in hook_views_data. How can I select Drupal's datetime filter (which extends Views 'date' filter) for my datetime field?

Is is possible to change default index.php to something else, like index2.php?

Thanks!

Steve